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Re:"Mad Libs" Style Form Increases Conversion 25-40% by grayrest on Thursday February 25, 2010 @12:58PM (#1151120)
The first place I saw this style of interaction is in the novella-weight Magic Ink [1] essay.

[1] http://worrydream.com/MagicInk/

Re:"Mad Libs" Style Form Increases Conversion 25-40% by warfangle on Thursday February 25, 2010 @01:42PM (#1151245)
Wow. This is amazing. Thanks so much for the link - bookmarking for later reading.